Smithsonian Magazine focuses on the Bell X-1, first aircraft to break the sound barrier - Capitol Communicator
Modern Marvels: Breaking The Sound Barrier (S9, E21)
What do pilots or passengers experience when a plane breaks the sound barrier (i.e. goes supersonic)? - Quora
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Echoing the Concorde, American is buying supersonic planes from aviation startup Boom - Vox
How the X-1 broke the sound barrier and changed the future of experimental flight
About That Sonic Boom Over Washington - by James Fallows
TIL there were supersonic passenger airplanes in the past that could go up to 1500 mph. However, our current commercial airliners only cruise at the speed of 575 mph : r/todayilearned
The Rocket Plane That Broke The Sound Barrier
What happens if an airliner reaches Mach 1, sound speed (1224km/h or 768 mph)? - Quora
Mach 1: Assaulting the Barrier, Air & Space Magazine
Chuck Yeager's 1947 Flight Inspired Our Supersonic Ambitions
1947 -- Breaking the Sound Barrier > Air Force Historical Support Division > Fact Sheets